Detect Thread exit to run jnius.detach() on Android

threading_jnius.py

# Goal: detect when a thread exit to call jnius.detach()
# and prevent crash from Android/ART
# So we listen to "return" events from the "run" function of the threading.Thread
# The profiling function given to threading.set_profilefunc() is installed in the
# thread before the run() function of the Thread.
# All we need to do is filter on "return" event of the "run" function for the 
# original Thread.run() of Python's threading.py

# ERROR: it doesn't detect when a thread crash (python exception)

import threading
try:
    import jnius
except:
    jnius = None

def thread_check_exit(frame, event, arg):
    if event != "return":
        return thread_check_exit
    code = frame.f_code
    if code.co_name != "run":
        return thread_check_exit
    if not code.co_filename.endswith("/threading.py"):
        return thread_check_exit
    try:
        if jnius:
            jnius.detach()
    except:
        pass
    return thread_check_exit
threading.setprofile(thread_check_exit)

threading_jnius_excepthook.py

# EDIT: this doesn't for threads, sorry. :(

try:
    import jnius
    import sys
    excepthook_orig = sys.excepthook
    def jnius_excepthook(*args):
        jnius.detach()
        return excepthook_orig(*args)
    sys.excepthook = jnius_excepthook
except ImportError:
    pass

threading_jnuis_monkeypatch.py

# alternative approach that works when the thread got an exception as well
import threading
try:
    import jnius
except:
    jnius = None

if jnius:
    orig_thread_run = threading.Thread.run
    def thread_check_run(*args, **kwargs):
        try:
            return orig_thread_run(*args, **kwargs)
        finally:
            jnius.detach()
    threading.Thread.run = thread_check_run